Wow, it's possible you'll have to have some welding done on the frame, to get any beavertail to properly fit; it's hard to tell with that, that, other grip safety installed.
Even if just for entertainment value, can you show us the bushing? There's really nothing wrong with a collet bushing that hasn't broken.
If you've been shooting the gun for thirty years and it's still working, the bushing probably will continure to work (and be more accurate than a poorly-fit solid bushing).